package com.example.games;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;

import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by 15pr on 2017/7/19.
 */

public class GamePanel extends View {

    private int mPanelWidth;
    private float mLineHeight;
    private  int MAX_LINE = 10;
    private int MAX_COUNT_IN_LINE = 5;
    private Paint mPaint = new Paint();

    private Bitmap mWhitePiece;
    private Bitmap mBlackPiece;

    private float ratioPieceOfLineHeight = 3 * 1.0f / 4;

    private ArrayList<Point> mWhiteArray = new ArrayList<>();
    private ArrayList<Point> mBlackArray = new ArrayList<>();

    //轮到白棋先走
    private boolean mIsWhite = true;

    private boolean mIsGameOver;
    private boolean mIsWhiteWinner;



    public GamePanel(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);


        init();
    }

    private void init(){
        mPaint.setColor(0x88000000);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);

        mWhitePiece = BitmapFactory.decodeResource(getResources(),R.drawable.stone_w2);
        mBlackPiece = BitmapFactory.decodeResource(getResources(),R.drawable.stone_b1);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);

        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);

        int width = Math.min(widthSize,heightSize);

        if(widthMode == MeasureSpec.UNSPECIFIED){
            width = heightSize;
        }else if(heightMode == MeasureSpec.UNSPECIFIED){
            width = widthSize;
        }

        setMeasuredDimension(width,width);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        mPanelWidth = w;
        mLineHeight = mPanelWidth *1.0f/MAX_LINE;

        int pieceWidth = (int)(mLineHeight * ratioPieceOfLineHeight);

        mWhitePiece = Bitmap.createScaledBitmap(mWhitePiece, pieceWidth, pieceWidth, false);
        mBlackPiece = Bitmap.createScaledBitmap(mBlackPiece, pieceWidth, pieceWidth, false);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if(mIsGameOver) return false;

        int action = event.getAction();

        if(action == MotionEvent.ACTION_UP) {
            int x = (int) event.getX();
            int y = (int) event.getY();

            Point p = getValidPoint(x,y);
            if(mWhiteArray.contains(p) || mBlackArray.contains(p)){
                return false;
            }

            if(mIsWhite){
                mWhiteArray.add(p);
            }else{
                mBlackArray.add(p);
            }
            invalidate();
            mIsWhite = !mIsWhite;
        }

        return true;
    }

    private Point getValidPoint(int x, int y) {
        return new Point((int)(x / mLineHeight),(int)(y/mLineHeight));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        drawBoard(canvas);

        drawPieces(canvas);

        checkGameOver();
    }

    private void checkGameOver() {
        boolean whiteWin = checkFiveInLine(mWhiteArray);
        boolean blackWin = checkFiveInLine(mBlackArray);

        if(whiteWin || blackWin){
            mIsGameOver = true;
            mIsWhiteWinner = whiteWin;

            String text = mIsWhiteWinner?"白棋胜利":"黑棋胜利";
            Toast.makeText(getContext(), text, Toast.LENGTH_SHORT).show();
        }
    }

    private boolean checkFiveInLine(List<Point> points) {
        for(Point p : points){
            int x = p.x;
            int y = p.y;
            
            boolean win = checkHorizontal(x,y,points);
            if(win) return true;
            win = checkVertical(x,y,points);
            if(win) return true;
            win = checkLeftDiagonal(x,y,points);
            if(win) return true;
            win = checkRightDiagonal(x,y,points);
            if(win) return true;
        }
        return false;
    }

    /**
     * 判断x,y位置的妻子，是否横向有相邻的五个一致
     * @param x
     * @param y
     * @param points
     * @return
     */
    private boolean checkHorizontal(int x, int y, List<Point> points) {
        int count = 1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x-i),y))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x+i),y))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        return false;
    }

    /**
     * 上下
     * @param x
     * @param y
     * @param points
     * @return
     */
    private boolean checkVertical(int x, int y, List<Point> points) {
        int count = 1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x),y+i))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x),y-i))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        return false;
    }

    private void drawPieces(Canvas canvas) {
        for(int i=0,n = mWhiteArray.size();i<n;i++){
            Point whitePoint = mWhiteArray.get(i);
            canvas.drawBitmap(mWhitePiece,(whitePoint.x + (1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (whitePoint.y + (1-ratioPieceOfLineHeight)/2)*mLineHeight,null);
        }

        for(int i=0,n = mBlackArray.size();i<n;i++){
            Point blackPoint = mBlackArray.get(i);
            canvas.drawBitmap(mBlackPiece,(blackPoint.x + (1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (blackPoint.y + (1-ratioPieceOfLineHeight)/2)*mLineHeight,null);
        }
    }

    private void drawBoard(Canvas canvas){
        int w = mPanelWidth;
        float lineHeight = mLineHeight;

        for(int i=0;i<MAX_LINE;i++){
            int startX = (int)(lineHeight/2);
            int endX = (int)(w-lineHeight/2);

            int y = (int)((0.5 + i) * lineHeight);

            canvas.drawLine(startX,y,endX,y,mPaint); //横线
            canvas.drawLine(y,startX,y,endX,mPaint); //竖线
        }
    }
    /**
     * 左斜
     */
    private boolean checkLeftDiagonal(int x, int y, List<Point> points) {
        int count = 1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x-i),(y+i)))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x+i),(y-i)))){
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        return false;
    }

    private boolean checkRightDiagonal(int x, int y, List<Point> points) {
        int count = 1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x-i),(y-i)))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point((x+i),(y+i)))) {
                count++;
            }else{
                break;
            }
        }
        if(count == MAX_COUNT_IN_LINE) return  true;
        return false;
    }
    public void start(){
        mWhiteArray.clear();
        mBlackArray.clear();
        mIsGameOver = false;
        mIsWhiteWinner = false;
        invalidate();
    }
    private static final String INSTANCE = "instance";
    private static final String INSTANCE_GAME_OVER = "instance_game_over";
    private static final String INSTANCE_WHITE_ARRAY = "instance_white_array";
    private static final String INSTANCE_BLACK_ARRAY = "instance_black_array";

    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE,super.onSaveInstanceState());
        bundle.putBoolean(INSTANCE_GAME_OVER,mIsGameOver);
        bundle.putParcelableArrayList(INSTANCE_WHITE_ARRAY,mWhiteArray);
        bundle.putParcelableArrayList(INSTANCE_BLACK_ARRAY,mBlackArray);
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if(state instanceof Bundle){
            Bundle bundle = (Bundle) state;
            mIsGameOver = bundle.getBoolean(INSTANCE_GAME_OVER);
            mWhiteArray = bundle.getParcelableArrayList(INSTANCE_WHITE_ARRAY);
            mBlackArray = bundle.getParcelableArrayList(INSTANCE_BLACK_ARRAY);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE));
            return ;
        }
        super.onRestoreInstanceState(state);
    }
}
